# db2_num_fields

(PECL ibm_db2 >= 1.0.0)

db2_num_fields — Returns the number of fields contained in a result set

### Beschreibung

db2_num_fields(resource `$stmt`): int|false

Returns the number of fields contained in a result set. This is most useful for handling the result sets returned by dynamically generated queries, or for result sets returned by stored procedures, where your application cannot otherwise know how to retrieve and use the results.

### Parameter-Liste

`stmt`
  A valid statement resource containing a result set.

### Rückgabewerte

Returns an integer value representing the number of fields in the result set associated with the specified statement resource. Returns `false` if the statement resource is not a valid input value.

### Beispiele

Beispiel #1 Retrieving the number of fields in a result set

The following example demonstrates how to retrieve the number of fields returned in a result set.

`<?php
$sql = "SELECT id, name, breed, weight FROM animals ORDER BY breed";
$stmt = db2_prepare($conn, $sql);
db2_execute($stmt, $sql);
$columns = db2_num_fields($stmt);
echo "There are {$columns} columns in the result set.";
?>`

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

    There are 4 columns in the result set.

### Siehe auch

- db2_execute() - Executes a prepared SQL statement
- db2_field_display_size() - Returns the maximum number of bytes required to display a column
- db2_field_name() - Returns the name of the column in the result set
- db2_field_num() - Returns the position of the named column in a result set
- db2_field_precision() - Returns the precision of the indicated column in a result set
- db2_field_scale() - Returns the scale of the indicated column in a result set
- db2_field_type() - Returns the data type of the indicated column in a result set
- db2_field_width() - Returns the width of the current value of the indicated column in a result set

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